<!DOCTYPE html><html><head>
      <title>js-jquery-data</title>
      <meta charset="utf-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      
      <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.10.2/dist/katex.min.css">
      
      

      
      
      
      
      
      

      <style>
      /**
 * prism.js Github theme based on GitHub's theme.
 * @author Sam Clarke
 */
code[class*="language-"],
pre[class*="language-"] {
  color: #333;
  background: none;
  font-family: Consolas, "Liberation Mono", Menlo, Courier, monospace;
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.4;

  -moz-tab-size: 8;
  -o-tab-size: 8;
  tab-size: 8;

  -webkit-hyphens: none;
  -moz-hyphens: none;
  -ms-hyphens: none;
  hyphens: none;
}

/* Code blocks */
pre[class*="language-"] {
  padding: .8em;
  overflow: auto;
  /* border: 1px solid #ddd; */
  border-radius: 3px;
  /* background: #fff; */
  background: #f5f5f5;
}

/* Inline code */
:not(pre) > code[class*="language-"] {
  padding: .1em;
  border-radius: .3em;
  white-space: normal;
  background: #f5f5f5;
}

.token.comment,
.token.blockquote {
  color: #969896;
}

.token.cdata {
  color: #183691;
}

.token.doctype,
.token.punctuation,
.token.variable,
.token.macro.property {
  color: #333;
}

.token.operator,
.token.important,
.token.keyword,
.token.rule,
.token.builtin {
  color: #a71d5d;
}

.token.string,
.token.url,
.token.regex,
.token.attr-value {
  color: #183691;
}

.token.property,
.token.number,
.token.boolean,
.token.entity,
.token.atrule,
.token.constant,
.token.symbol,
.token.command,
.token.code {
  color: #0086b3;
}

.token.tag,
.token.selector,
.token.prolog {
  color: #63a35c;
}

.token.function,
.token.namespace,
.token.pseudo-element,
.token.class,
.token.class-name,
.token.pseudo-class,
.token.id,
.token.url-reference .token.variable,
.token.attr-name {
  color: #795da3;
}

.token.entity {
  cursor: help;
}

.token.title,
.token.title .token.punctuation {
  font-weight: bold;
  color: #1d3e81;
}

.token.list {
  color: #ed6a43;
}

.token.inserted {
  background-color: #eaffea;
  color: #55a532;
}

.token.deleted {
  background-color: #ffecec;
  color: #bd2c00;
}

.token.bold {
  font-weight: bold;
}

.token.italic {
  font-style: italic;
}


/* JSON */
.language-json .token.property {
  color: #183691;
}

.language-markup .token.tag .token.punctuation {
  color: #333;
}

/* CSS */
code.language-css,
.language-css .token.function {
  color: #0086b3;
}

/* YAML */
.language-yaml .token.atrule {
  color: #63a35c;
}

code.language-yaml {
  color: #183691;
}

/* Ruby */
.language-ruby .token.function {
  color: #333;
}

/* Markdown */
.language-markdown .token.url {
  color: #795da3;
}

/* Makefile */
.language-makefile .token.symbol {
  color: #795da3;
}

.language-makefile .token.variable {
  color: #183691;
}

.language-makefile .token.builtin {
  color: #0086b3;
}

/* Bash */
.language-bash .token.keyword {
  color: #0086b3;
}

/* highlight */
pre[data-line] {
  position: relative;
  padding: 1em 0 1em 3em;
}
pre[data-line] .line-highlight-wrapper {
  position: absolute;
  top: 0;
  left: 0;
  background-color: transparent;
  display: block;
  width: 100%;
}

pre[data-line] .line-highlight {
  position: absolute;
  left: 0;
  right: 0;
  padding: inherit 0;
  margin-top: 1em;
  background: hsla(24, 20%, 50%,.08);
  background: linear-gradient(to right, hsla(24, 20%, 50%,.1) 70%, hsla(24, 20%, 50%,0));
  pointer-events: none;
  line-height: inherit;
  white-space: pre;
}

pre[data-line] .line-highlight:before, 
pre[data-line] .line-highlight[data-end]:after {
  content: attr(data-start);
  position: absolute;
  top: .4em;
  left: .6em;
  min-width: 1em;
  padding: 0 .5em;
  background-color: hsla(24, 20%, 50%,.4);
  color: hsl(24, 20%, 95%);
  font: bold 65%/1.5 sans-serif;
  text-align: center;
  vertical-align: .3em;
  border-radius: 999px;
  text-shadow: none;
  box-shadow: 0 1px white;
}

pre[data-line] .line-highlight[data-end]:after {
  content: attr(data-end);
  top: auto;
  bottom: .4em;
}html body{font-family:"Helvetica Neue",Helvetica,"Segoe UI",Arial,freesans,sans-serif;font-size:16px;line-height:1.6;color:#333;background-color:#fff;overflow:initial;box-sizing:border-box;word-wrap:break-word}html body>:first-child{margin-top:0}html body h1,html body h2,html body h3,html body h4,html body h5,html body h6{line-height:1.2;margin-top:1em;margin-bottom:16px;color:#000}html body h1{font-size:2.25em;font-weight:300;padding-bottom:.3em}html body h2{font-size:1.75em;font-weight:400;padding-bottom:.3em}html body h3{font-size:1.5em;font-weight:500}html body h4{font-size:1.25em;font-weight:600}html body h5{font-size:1.1em;font-weight:600}html body h6{font-size:1em;font-weight:600}html body h1,html body h2,html body h3,html body h4,html body h5{font-weight:600}html body h5{font-size:1em}html body h6{color:#5c5c5c}html body strong{color:#000}html body del{color:#5c5c5c}html body a:not([href]){color:inherit;text-decoration:none}html body a{color:#08c;text-decoration:none}html body a:hover{color:#00a3f5;text-decoration:none}html body img{max-width:100%}html body>p{margin-top:0;margin-bottom:16px;word-wrap:break-word}html body>ul,html body>ol{margin-bottom:16px}html body ul,html body ol{padding-left:2em}html body ul.no-list,html body ol.no-list{padding:0;list-style-type:none}html body ul ul,html body ul ol,html body ol ol,html body ol ul{margin-top:0;margin-bottom:0}html body li{margin-bottom:0}html body li.task-list-item{list-style:none}html body li>p{margin-top:0;margin-bottom:0}html body .task-list-item-checkbox{margin:0 .2em .25em -1.8em;vertical-align:middle}html body .task-list-item-checkbox:hover{cursor:pointer}html body blockquote{margin:16px 0;font-size:inherit;padding:0 15px;color:#5c5c5c;border-left:4px solid #d6d6d6}html body blockquote>:first-child{margin-top:0}html body blockquote>:last-child{margin-bottom:0}html body hr{height:4px;margin:32px 0;background-color:#d6d6d6;border:0 none}html body table{margin:10px 0 15px 0;border-collapse:collapse;border-spacing:0;display:block;width:100%;overflow:auto;word-break:normal;word-break:keep-all}html body table th{font-weight:bold;color:#000}html body table td,html body table th{border:1px solid #d6d6d6;padding:6px 13px}html body dl{padding:0}html body dl dt{padding:0;margin-top:16px;font-size:1em;font-style:italic;font-weight:bold}html body dl dd{padding:0 16px;margin-bottom:16px}html body code{font-family:Menlo,Monaco,Consolas,'Courier New',monospace;font-size:.85em !important;color:#000;background-color:#f0f0f0;border-radius:3px;padding:.2em 0}html body code::before,html body code::after{letter-spacing:-0.2em;content:"\00a0"}html body pre>code{padding:0;margin:0;font-size:.85em !important;word-break:normal;white-space:pre;background:transparent;border:0}html body .highlight{margin-bottom:16px}html body .highlight pre,html body pre{padding:1em;overflow:auto;font-size:.85em !important;line-height:1.45;border:#d6d6d6;border-radius:3px}html body .highlight pre{margin-bottom:0;word-break:normal}html body pre code,html body pre tt{display:inline;max-width:initial;padding:0;margin:0;overflow:initial;line-height:inherit;word-wrap:normal;background-color:transparent;border:0}html body pre code:before,html body pre tt:before,html body pre code:after,html body pre tt:after{content:normal}html body p,html body blockquote,html body ul,html body ol,html body dl,html body pre{margin-top:0;margin-bottom:16px}html body kbd{color:#000;border:1px solid #d6d6d6;border-bottom:2px solid #c7c7c7;padding:2px 4px;background-color:#f0f0f0;border-radius:3px}@media print{html body{background-color:#fff}html body h1,html body h2,html body h3,html body h4,html body h5,html body h6{color:#000;page-break-after:avoid}html body blockquote{color:#5c5c5c}html body pre{page-break-inside:avoid}html body table{display:table}html body img{display:block;max-width:100%;max-height:100%}html body pre,html body code{word-wrap:break-word;white-space:pre}}.markdown-preview{width:100%;height:100%;box-sizing:border-box}.markdown-preview .pagebreak,.markdown-preview .newpage{page-break-before:always}.markdown-preview pre.line-numbers{position:relative;padding-left:3.8em;counter-reset:linenumber}.markdown-preview pre.line-numbers>code{position:relative}.markdown-preview pre.line-numbers .line-numbers-rows{position:absolute;pointer-events:none;top:1em;font-size:100%;left:0;width:3em;letter-spacing:-1px;border-right:1px solid #999;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.markdown-preview pre.line-numbers .line-numbers-rows>span{pointer-events:none;display:block;counter-increment:linenumber}.markdown-preview pre.line-numbers .line-numbers-rows>span:before{content:counter(linenumber);color:#999;display:block;padding-right:.8em;text-align:right}.markdown-preview .mathjax-exps .MathJax_Display{text-align:center !important}.markdown-preview:not([for="preview"]) .code-chunk .btn-group{display:none}.markdown-preview:not([for="preview"]) .code-chunk .status{display:none}.markdown-preview:not([for="preview"]) .code-chunk .output-div{margin-bottom:16px}.scrollbar-style::-webkit-scrollbar{width:8px}.scrollbar-style::-webkit-scrollbar-track{border-radius:10px;background-color:transparent}.scrollbar-style::-webkit-scrollbar-thumb{border-radius:5px;background-color:rgba(150,150,150,0.66);border:4px solid rgba(150,150,150,0.66);background-clip:content-box}html body[for="html-export"]:not([data-presentation-mode]){position:relative;width:100%;height:100%;top:0;left:0;margin:0;padding:0;overflow:auto}html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{position:relative;top:0}@media screen and (min-width:914px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{padding:2em calc(50% - 457px + 2em)}}@media screen and (max-width:914px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{padding:2em}}@media screen and (max-width:450px){html body[for="html-export"]:not([data-presentation-mode]) .markdown-preview{font-size:14px !important;padding:1em}}@media print{html body[for="html-export"]:not([data-presentation-mode]) #sidebar-toc-btn{display:none}}html body[for="html-export"]:not([data-presentation-mode]) #sidebar-toc-btn{position:fixed;bottom:8px;left:8px;font-size:28px;cursor:pointer;color:inherit;z-index:99;width:32px;text-align:center;opacity:.4}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] #sidebar-toc-btn{opacity:1}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc{position:fixed;top:0;left:0;width:300px;height:100%;padding:32px 0 48px 0;font-size:14px;box-shadow:0 0 4px rgba(150,150,150,0.33);box-sizing:border-box;overflow:auto;background-color:inherit}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar{width:8px}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar-track{border-radius:10px;background-color:transparent}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc::-webkit-scrollbar-thumb{border-radius:5px;background-color:rgba(150,150,150,0.66);border:4px solid rgba(150,150,150,0.66);background-clip:content-box}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc a{text-decoration:none}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc ul{padding:0 1.6em;margin-top:.8em}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc li{margin-bottom:.8em}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .md-sidebar-toc ul{list-style-type:none}html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .markdown-preview{left:300px;width:calc(100% -  300px);padding:2em calc(50% - 457px -  150px);margin:0;box-sizing:border-box}@media screen and (max-width:1274px){html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .markdown-preview{padding:2em}}@media screen and (max-width:450px){html body[for="html-export"]:not([data-presentation-mode])[html-show-sidebar-toc] .markdown-preview{width:100%}}html body[for="html-export"]:not([data-presentation-mode]):not([html-show-sidebar-toc]) .markdown-preview{left:50%;transform:translateX(-50%)}html body[for="html-export"]:not([data-presentation-mode]):not([html-show-sidebar-toc]) .md-sidebar-toc{display:none}
/* Please visit the URL below for more information: */
/*   https://shd101wyy.github.io/markdown-preview-enhanced/#/customize-css */

      </style>
    </head>
    <body for="html-export">
      <div class="mume markdown-preview  ">
      <h1 class="mume-header" id="jquery-data%E6%96%B9%E6%B3%95">jquery data&#x65B9;&#x6CD5;</h1>

<p>&#x5728;&#x524D;&#x7AEF;&#x6211;&#x4EEC;&#x7ECF;&#x5E38;&#x4F1A;&#x505A;&#x7684;&#x64CD;&#x4F5C;&#x5C31;&#x662F;<strong>&#x505A;&#x6570;&#x636E;&#x72B6;&#x6001;&#x7684;&#x5224;&#x65AD;&#x548C;&#x6570;&#x636E;&#x5904;&#x7406;&#x3001;&#x63D0;&#x4EA4;</strong>&#xFF0C;&#x7ECF;&#x5E38;&#x4F1A;&#x64CD;&#x4F5C;dom&#xFF0C;&#x4E5F;&#x4F1A;&#x4FDD;&#x5B58;&#x4E00;&#x4E2A;<strong>&#x5168;&#x5C40;&#x7684;&#x6570;&#x636E;&#x5904;&#x7406;</strong>&#x3002;&#x8FD9;&#x6837;&#x505A;&#x662F;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x5F88;&#x591A;&#x529F;&#x80FD;&#xFF0C;&#x4F46;&#x662F;&#x7F3A;&#x70B9;&#x5C31;&#x662F;&#x8FC7;&#x591A;<strong>&#x64CD;&#x4F5C;dom&#x4F1A;&#x6D6A;&#x8D39;&#x6027;&#x80FD;</strong>&#xFF0C;&#x5168;&#x5C40;&#x6570;&#x636E;&#x4FDD;&#x5B58;&#x591A;&#x4E86;&#x6709;&#x65F6;&#x5019;&#x771F;&#x7684;&#x4F1A;&#x641E;&#x6DF7;&#x6DC6;&#x3002;&#x6240;&#x4EE5;jq&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;<strong>data()&#x7F13;&#x5B58;&#x673A;&#x5236;</strong>&#xFF0C;&#x6709;&#x4E24;&#x79CD;&#x4F7F;&#x7528;&#x65B9;&#x5F0F;&#xFF0C;<strong>&#x4E00;&#x79CD;&#x662F;&#x7ED1;&#x5B9A;&#x5728;&#x5143;&#x7D20;&#x4E0A;&#x9762;&#x7684;data()&#xFF0C;&#x4E00;&#x79CD;&#x662F;&#x5B58;&#x50A8;&#x5728;&#x4E00;&#x4E2A;&#x94FE;&#x5F0F;&#x7684;&#x5BF9;&#x8C61;&#x4E0A;&#x9762;</strong>&#x3002;&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x5C31;&#x6765;&#x4ECB;&#x7ECD;&#x8FD9;&#x4E24;&#x79CD;&#x4F7F;&#x7528;&#x65B9;&#x5F0F;&#x3002;</p>
<h4 class="mume-header" id="%E7%AC%AC%E4%B8%80%E7%A7%8D%E7%BB%91%E5%AE%9A%E5%9C%A8dom%E4%B8%8A">&#x7B2C;&#x4E00;&#x79CD;&#xFF1A;&#x7ED1;&#x5B9A;&#x5728;dom&#x4E0A;</h4>

<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  <span class="token keyword">var</span> dom <span class="token operator">=</span> document<span class="token punctuation">.</span>body<span class="token punctuation">;</span>
  $<span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span>dom<span class="token punctuation">,</span> <span class="token string">&apos;name&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&#x5F20;&#x4E09;&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;body&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span><span class="token string">&apos;name&apos;</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
</pre><p>&#x8FD9;&#x91CC;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x60F3;&#xFF0C;&#x5B83;&#x4EEC;&#x5B58;&#x50A8;&#x5728;&#x54EA;&#x91CC;&#x5462;&#xFF1F;&#x6211;&#x4EEC;&#x7528;&#x627E;&#x5230;body&#x53D1;&#x73B0;&#x6CA1;&#x6709;&#x5B58;&#x50A8;&#x5728;&#x6807;&#x7B7E;&#x91CC;&#x9762;&#xFF0C;&#x8F93;&#x51FA;&#x8FD9;&#x4E2A;body&#x4E5F;&#x627E;&#x4E0D;&#x5230;&#x3002;</p>
<p><strong>&#x5176;&#x5B9E;&#x554A;&#xFF0C;&#x8FD9;&#x4E2A;data&#x7ED1;&#x5B9A;&#x5728;&#x5B83;&#x7684;&#x4E00;&#x4E2A;&#x7F13;&#x5B58;&#x91CC;&#x9762;&#xFF0C;&#x6211;&#x4EEC;&#x4F7F;&#x7528;jQuery.cache&#xFF0C;&#x53D1;&#x73B0;&#x8F93;&#x51FA;&#x4E86;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x51FA;&#x6765;&#xFF0C;&#x91CC;&#x9762;&#x5C31;&#x6709;&#x4FDD;&#x5B58;&#x6211;&#x4EEC;&#x521A;&#x521A;&#x8BBE;&#x7F6E;&#x7684;&#x6570;&#x636E;&#xFF0C;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x770B;&#x4F5C;&#x4E00;&#x4E2A;&#x7F13;&#x5B58;&#x6C60;&#x6216;&#x8005;&#x662F;&#x7F13;&#x5B58;&#x94FE;&#x8868;&#x3002;&#x6211;&#x4EEC;&#x8FD8;&#x53D1;&#x73B0;&#x5B83;&#x8FD9;&#x4E2A;&#x8F93;&#x51FA;&#x7684;&#x5BF9;&#x8C61;&#x90FD;&#x662F;&#x6570;&#x5B57;&#x5F00;&#x5934;&#x7684;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x5F97;&#x60F3;&#x529E;&#x6CD5;&#x627E;&#x5230;&#x4ED6;&#x7684;&#x8FD9;&#x4E2A;&#x8282;&#x70B9;</strong></p>
<p><strong>&#x4ECE;jq&#x7684;&#x6587;&#x6863;&#x4E2D;&#x5F97;&#x77E5;&#x8FD9;&#x4E2A;data&#x4E0D;&#x4F1A;&#x76F4;&#x63A5;&#x4FDD;&#x5B58;&#x5728;&#x5143;&#x7D20;&#x4E0A;&#x9762;&#xFF0C;&#x800C;&#x662F;&#x4FDD;&#x5B58;&#x5728;&#x8FD9;&#x4E2A;cache&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x4E0A;&#x9762;&#xFF0C;&#x5148;&#x7ED9;&#x8FD9;&#x4E2A;&#x5143;&#x7D20;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;jQuery.expando&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x8FD9;&#x91CC;&#x9762;&#x6709;&#x4E00;&#x4E2A;uuid&#x6216;&#x8005;&#x662F;uid&#xFF08;&#x8FD9;&#x91CC;&#x662F;&#x6839;&#x636E;&#x4E0D;&#x540C;&#x7684;jq&#x7248;&#x672C;&#x6765;&#x7684;&#xFF09;&#xFF0C;&#x8FD9;&#x4E2A;uuid&#x662F;&#x4E00;&#x4E2A;&#x8FDE;&#x7EED;&#x7684;&#x6570;&#x5B57;&#xFF0C;&#x8DDF;&#x6211;&#x4EEC;&#x5F00;&#x59CB;&#x770B;&#x5230;&#x7684;cache&#x5BF9;&#x8C61;&#x5BF9;&#x5E94;&#x7684;&#x4E00;&#x6A21;&#x4E00;&#x6837;&#x3002;</strong></p>
<p>&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x8FD9;&#x91CC;&#x628A;jQuery.expando&#x8F93;&#x51FA;&#xFF0C;&#x5F97;&#x5230;&#x4E86;&#x4E00;&#x4E2A;&#x4E32;&quot;jQuery110200914271316066011&quot;&#x8FD9;&#x6837;&#x7C7B;&#x4F3C;&#x7684;&#xFF0C;&#x5F97;&#x5230;&#x5B83;&#x4EE5;&#x540E;&#x600E;&#x4E48;&#x627E;&#x5230;cache&#x5BF9;&#x8C61;&#x7684;&#x5BF9;&#x5E94;&#x6570;&#x5B57;&#x5462;&#xFF0C;&#x6211;&#x4EEC;&#x7528;&#x521A;&#x521A;&#x5B9A;&#x4E49;&#x7684;dom&#x6765;&#x64CD;&#x4F5C;&#xFF0C;&#x53EF;&#x4EE5;&#x5F97;&#x5230;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x4E2A;&#x6570;&#x5B57;&#x5C31;&#x5BF9;&#x5E94;cache&#x91CC;&#x9762;&#x7684;&#xFF0C;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  jQuery<span class="token punctuation">.</span>expando<span class="token punctuation">;</span>
  dom<span class="token punctuation">[</span>jQuery<span class="token punctuation">.</span>expando<span class="token punctuation">]</span>
</pre><p>&#x63A5;&#x4E0B;&#x6765;&#x6211;&#x4EEC;&#x53BB;jq&#x91CC;&#x9762;&#x627E;&#x5230;&#x8FD9;&#x4E2A;expando</p>
<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  expando<span class="token punctuation">:</span> <span class="token string">&quot;jQuery&quot;</span> <span class="token operator">+</span> <span class="token punctuation">(</span> jQuery<span class="token punctuation">.</span>fn<span class="token punctuation">.</span>jquery <span class="token operator">+</span> Math<span class="token punctuation">.</span><span class="token function">random</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">replace</span><span class="token punctuation">(</span> <span class="token regex">/\D/g</span><span class="token punctuation">,</span> <span class="token string">&quot;&quot;</span> <span class="token punctuation">)</span><span class="token punctuation">,</span>
</pre><p>&#x4E0B;&#x9762;&#x6211;&#x4EEC;&#x5C1D;&#x8BD5;&#x4E00;&#x4E0B;&#x7528;&#x8FD9;&#x4E2A;cache&#x83B7;&#x53D6;&#x4E00;&#x4E0B;&#x6211;&#x4EEC;&#x521A;&#x521A;&#x5B58;&#x50A8;&#x7684;&#x6570;&#x636E;</p>
<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  jQuery<span class="token punctuation">.</span>cache<span class="token punctuation">[</span>dom<span class="token punctuation">[</span>jQuery<span class="token punctuation">.</span>expando<span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">.</span>data<span class="token punctuation">.</span>name
</pre><h4 class="mume-header" id="%E7%AC%AC%E4%BA%8C%E7%A7%8D%E4%B8%8D%E7%BB%91%E5%AE%9A%E5%9C%A8%E5%85%83%E7%B4%A0%E4%B8%8A%E9%9D%A2%E7%BB%91%E5%AE%9A%E5%9C%A8%E5%AF%B9%E8%B1%A1%E4%B8%8A%E9%9D%A2">&#x7B2C;&#x4E8C;&#x79CD;&#xFF1A;&#x4E0D;&#x7ED1;&#x5B9A;&#x5728;&#x5143;&#x7D20;&#x4E0A;&#x9762;&#xFF0C;&#x7ED1;&#x5B9A;&#x5728;&#x5BF9;&#x8C61;&#x4E0A;&#x9762;</h4>

<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  <span class="token keyword">var</span> obj <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
  jQuery<span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> <span class="token string">&apos;name&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;&#x738B;&#x9EBB;&#x5B50;&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</pre><p>&#x8FD9;&#x91CC;&#x7684;obj&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x7684;&#x662F;&#x4E00;&#x4E2A;expando&#x5BF9;&#x8C61;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x8C03;&#x7528;&#x7684;&#x65F6;&#x5019;&#x53EF;&#x4EE5;&#xFF1A;</p>
<pre data-role="codeBlock" data-info="javascript" class="language-javascript">  obj<span class="token punctuation">.</span>jQuery110208157397060133658<span class="token punctuation">.</span>data<span class="token punctuation">.</span>name<span class="token punctuation">;</span>
  obj<span class="token punctuation">[</span>jQuery<span class="token punctuation">.</span>expando<span class="token punctuation">]</span><span class="token punctuation">.</span>data<span class="token punctuation">.</span>name<span class="token punctuation">;</span>
</pre><h1 class="mume-header" id="attr%E4%B8%8Edata%E7%9A%84%E5%8C%BA%E5%88%AB">.attr()&#x4E0E;.data()&#x7684;&#x533A;&#x522B;</h1>

<h4 class="mume-header" id="%E6%9C%AC%E8%B4%A8%E5%8C%BA%E5%88%AB">&#x672C;&#x8D28;&#x533A;&#x522B;</h4>

<p><strong>attr&#x548C;data</strong>&#x672C;&#x8D28;&#x4E0A;&#x5C5E;&#x4E8E;DOM&#x5C5E;&#x6027;&#x548C;Jquery&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x7684;&#x533A;&#x522B;&#x3002;</p>
<pre data-role="codeBlock" data-info="html" class="language-html"><span class="token doctype">&lt;!DOCTYPE html&gt;</span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>Jquery&#x4E2D;.attr&#x548C;.data&#x7684;&#x533A;&#x522B;<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
        <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>app<span class="token punctuation">&quot;</span></span> <span class="token attr-name">data-foo</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>hello<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>text/javascript<span class="token punctuation">&quot;</span></span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>http://cdn.bootcss.com/jquery/3.1.1/jquery.min.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script language-javascript"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">&quot;</span>text/javascript<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script language-javascript">
        <span class="token keyword">var</span> getAttr1 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&apos;data-foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> getData1 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span><span class="token string">&apos;foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getAttr1: &apos;</span> <span class="token operator">+</span> getAttr1<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//hello</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getData1: &apos;</span> <span class="token operator">+</span> getData1<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//hello</span>

        <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&apos;data-foo&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;world&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//$.attr &#x8BBE;&#x7F6E;DOM&#x5143;&#x7D20;&#x5C5E;&#x6027;&#x503C;</span>
        <span class="token keyword">var</span> getAttr2 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&apos;data-foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> getData2 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span><span class="token string">&apos;foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getAttr2: &apos;</span> <span class="token operator">+</span> getAttr2<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//world</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getData2: &apos;</span> <span class="token operator">+</span> getData2<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//*** hello ***</span>

        <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span><span class="token string">&apos;foo&apos;</span><span class="token punctuation">,</span> <span class="token string">&apos;WORLD&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//$.data &#x8BBE;&#x7F6E;DOM node&#x5C5E;&#x6027;&#x503C;</span>
        <span class="token keyword">var</span> getAttr3 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">attr</span><span class="token punctuation">(</span><span class="token string">&apos;data-foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">var</span> getData3 <span class="token operator">=</span> <span class="token function">$</span><span class="token punctuation">(</span><span class="token string">&apos;#app&apos;</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">data</span><span class="token punctuation">(</span><span class="token string">&apos;foo&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getAttr3: &apos;</span> <span class="token operator">+</span> getAttr3<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//world</span>
        console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">&apos;getData3: &apos;</span> <span class="token operator">+</span> getData3<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//*** WORLD ***</span>

    </span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</pre><ol>
<li>attr()&#x6BCF;&#x6B21;&#x90FD;&#x4ECE;DOM&#x5143;&#x7D20;&#x4E2D;&#x53D6;&#x5C5E;&#x6027;&#x7684;&#x503C;&#xFF0C;&#x5373;&#x548C;&#x89C6;&#x56FE;&#x4E2D;&#x6807;&#x7B7E;&#x5185;&#x7684;&#x5C5E;&#x6027;&#x503C;&#x4FDD;&#x6301;&#x4E00;&#x81F4;&#x3002;<br>
attr(&apos;data-foo&apos;)&#x4F1A;&#x4ECE;&#x6807;&#x7B7E;&#x5185;&#x83B7;&#x5F97;data-foo&#x5C5E;&#x6027;&#x503C;&#xFF1B;<br>
attr(&apos;data-foo&apos;, &apos;world&apos;)&#x4F1A;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&apos;world&apos;&#x585E;&#x5230;&#x6807;&#x7B7E;&#x7684;data-foo&#x5C5E;&#x6027;&#x4E2D;&#xFF1B;</li>
<li>data()&#x662F;&#x4ECE;Jquery&#x5BF9;&#x8C61;&#x4E2D;&#x53D6;&#x503C;&#xFF0C;&#x7531;&#x4E8E;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x503C;&#x4FDD;&#x5B58;&#x5728;&#x5185;&#x5B58;&#x4E2D;&#xFF0C;&#x56E0;&#x6B64;&#x53EF;&#x80FD;&#x548C;&#x89C6;&#x56FE;&#x91CC;&#x7684;&#x5C5E;&#x6027;&#x503C;&#x4E0D;&#x4E00;&#x81F4;&#x7684;&#x60C5;&#x51B5;&#x3002;<br>
data(&apos;foo&apos;)&#x4F1A;&#x4ECE;Jquery&#x5BF9;&#x8C61;&#x5185;&#x83B7;&#x5F97;foo&#x7684;&#x5C5E;&#x6027;&#x503C;&#xFF0C;&#x4E0D;&#x662F;&#x4ECE;&#x6807;&#x7B7E;&#x5185;&#x83B7;&#x5F97;data-foo&#x5C5E;&#x6027;&#x503C;&#xFF1B;<br>
data(&apos;foo&apos;, &apos;world&apos;)&#x4F1A;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&apos;world&apos;&#x585E;&#x5230;Jquery&#x5BF9;&#x8C61;&#x7684;foo&#x5C5E;&#x6027;&#x4E2D;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x585E;&#x5230;&#x89C6;&#x56FE;&#x6807;&#x7B7E;&#x7684;data-foo&#x5C5E;&#x6027;&#x4E2D;&#x3002;</li>
</ol>
<h4 class="mume-header" id="%E5%BB%BA%E8%AE%AE">&#x5EFA;&#x8BAE;</h4>

<ol>
<li>&#x4ECE;&#x6027;&#x80FD;&#x7684;&#x89D2;&#x5EA6;&#x6765;&#x8BF4;&#xFF0C;&#x5EFA;&#x8BAE;&#x4F7F;&#x7528;$.data()&#x6765;&#x8FDB;&#x884C;set&#x548C;get&#x64CD;&#x4F5C;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x4EC5;&#x4EC5;&#x4FEE;&#x6539;&#x7684;Jquey&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x503C;&#xFF0C;&#x4E0D;&#x4F1A;&#x5F15;&#x8D77;&#x989D;&#x5916;&#x7684;DOM&#x64CD;&#x4F5C;&#x3002;</li>
<li>attr()&#x548C;data()&#x5E94;&#x907F;&#x514D;&#x6DF7;&#x5408;&#x7528;&#x3002;</li>
</ol>

      </div>
      
      
    
    
    
    
    
    
    
    
  
    </body></html>